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# File 'lib/fast_excel.rb', line 25
def self.open(filename = nil, constant_memory: false, default_format: nil)
tmp_file = false
if filename
if File.exist?(filename) && File.size(filename) > 0
raise ArgumentError, "File '#{filename}' already exists. FastExcel can not open existing files, only create new files"
end
else
require 'tmpdir'
filename = "#{Dir.mktmpdir}/fast_excel.xlsx"
tmp_file = true
end
filename = filename.to_s if defined?(Pathname) && filename.is_a?(Pathname)
opt = Libxlsxwriter::WorkbookOptions.new
opt[:constant_memory] = constant_memory ? 1 : 0
workbook = Libxlsxwriter.workbook_new_opt(filename, opt)
result = Libxlsxwriter::Workbook.new(workbook)
if default_format
raise "default_format argument must be a hash" unless default_format.is_a?(Hash)
result.default_format.set(default_format)
end
result.tmp_file = tmp_file
result.filename = filename
result
end
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